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Vulnerability in Mozilla Firefox for iOS (July 7, 2026)

unknownCVE-2026-13356
A vulnerability has been discovered in Mozilla Firefox for iOS. It allows an attacker to bypass the security policy.

CSIRTS triage

vendor: Mozillaproduct: Firefox for iOSAuthentication bypass
What
A vulnerability allows bypassing the security policy.
Who is affected
Users of Mozilla Firefox for iOS are affected.
Urgency
Remediation is urgent due to the potential for exploitation.
Action
Update Firefox for iOS to the latest version to mitigate the issue.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CERT-FR Avis de sécurité (FR · national-cert · site)
Severity
unknown
Published
2026-07-07
Exploitation
Not in CISA KEV at last sync
Language
Machine-translated to English — verify against the original

Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0839/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-13356coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Mozilla Firefox for

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from CERT-FR Avis de sécurité